Thermal Magnetic Circuit Breakers

Thermal magnetic circuit breakers are devices that provide protection against overcurrent in circuits. Circuit breakers use an automatically operated electrical switch to disrupt the flow of current when an overload or short circuit is detected. Thermal magnetic circuit breakers do this using an electromagnet and bimetallic strips. 


Circuit breakers provide more sophisticated protection against overcurrent than a simple fuse. Fuses simply burn out and have to be replaced, whereas circuit breakers just need to be reset.


How do thermal magnetic circuit breakers work?

In thermal magnetic circuit breakers, there are two ways the flow of current might be detected and disrupted. In the event of a short circuit, the electromagnet rapidly trips the switch. If the overload is smaller, over a longer period of time, the bimetallic strips will instead eventually react to trip the switch. 


What are thermal magnetic circuit breakers used for?

Thermal magnetic circuit breakers are most often used in distribution boards. They make up part of the subsidiary circuits in the broader electrical supply system, protecting against overcurrent.


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Description Price Current Rating Number of Poles Range Voltage Rating Width Series Application Break Time Breaking Capacity at Maximum Voltage Rating Circuit Breaker Type Mounting Hole Diameter Mounting Hole Length Mounting Hole Size Mounting Hole Width
RS Stock No. 881-0401
Mfr. Part No.1656660
MYR23.03
Each
units
- - - - - VS-SI-BZ - - - - - - - -
RS Stock No. 782-0915
Mfr. Part No.W58-XB1A4A-5
MYR22.17
Each
units
5A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 272-909
Mfr. Part No.GV3P25
MYR1,580.20
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -
RS Stock No. 312-3881
Mfr. Part No.GB2DB22
MYR285.71
Each
units
20A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1.5 kA - - - - -
RS Stock No. 610-0910
Mfr. Part No.GB2CD16
MYR179.54
Each
units
10A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 1.5 (ac) kA - - - - -
RS Stock No. 782-7865
Mfr. Part No.W67-X2Q12-20
MYR110.36
Each
units
20A 1 - 277V ac 0.75in W67 - - - - - - - -
RS Stock No. 335-996
Mfr. Part No.106-P30-000040-2A
BrandETA
MYR53.71
Each
units
2A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 782-0918
Mfr. Part No.W58-XB1A4A-30
MYR25.67
Each
units
30A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 335-980
Mfr. Part No.106-P30-000040-3A
BrandETA
MYR46.22
Each
units
3A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 312-3645
Mfr. Part No.GB2CB07
MYR100.55
Each
units
2A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 15 (ac) kA - - - - -
RS Stock No. 782-0909
Mfr. Part No.W28-XQ1A-2
MYR15.35
Each
units
2A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS Stock No. 881-1132
Mfr. Part No.CMB-033-11C3N-B-A
MYR14.62
Each
units
3A 1 - - - CMB Audio Visual Equipment, Household Appliances, Marine Applications, Medical Equipment, Power Strips, Power Supplies, Transportation Time Delayed 2500 A @ 32 V dc - - 10mm 10 x 11.2mm 11.2mm
RS Stock No. 898-1547
Mfr. Part No.1D4UM
BrandAltech
MYR78.73
Each
units
4A 1 - 42V dc - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, Heaters and Reactive Loads, High Inrush Motors, Power Supplies, Transformers, UL508 Application Time Delay 10 kA MCCB - - - -
RS Stock No. 150-085
Mfr. Part No.1610-21-30A
BrandETA
MYR30.47
Each
units
30A 1 - 32V dc 20mm 1610 - - - - - - - -
RS Stock No. 782-8038
Mfr. Part No.W58-XB1A4A-6
MYR25.67
Each
units
6A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 868-8778
Mfr. Part No.4400.0010
BrandSchurter
MYR27.54
Each
units
3A 1 - 48 V dc, 240 V ac - T11-211 Household Appliances, Industrial Appliances, Power Supplies and Chargers, Power Tools - 2 kA MCB - - - -
RS Stock No. 729-2786
Mfr. Part No.3120-F554-P7T1-W02D-20A
BrandETA
MYR133.60
Each
units
20A 2 - - - 3120-F - - - - - - - -
RS Stock No. 898-2048
Mfr. Part No.1Z40UM
BrandAltech
MYR149.52
Each
units
40A 1 - 24V dc - V-EA AC Discharge Lamps (Ballast), AC General Use, AC Incandescent Lamps (Tungsten), AC Motor Starting, AC Resistance, Across the Line, Components which Fail-Short, Components/Devices with Low Surge Current and Short Circuit Withstand Capabilities, Semiconductors, UL508 Application Time Delay 10 kA MCCB - - - -
RS Stock No. 323-9009
Mfr. Part No.GB2CD07
MYR200.23
Each
units
2A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 15 (ac) kA - - - - -
RS Stock No. 333-237
Mfr. Part No.201-1A
BrandETA
MYR136.29
Each
units
1A 1 - - 80mm 201 - - - - - - - -
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